I've been getting intermittent "Bonnet Open" coming up after I open/close the bonnet for whatever reason. Normally I just stick my fingers under the switch an wiggle and that temporarily fixes it but today that didn't work.

Reason it generally fails is that grunge/mud/muck get into the switch housing unit and the that stops the micro-switch from having enough travel to work.

Its a really simple fix and I would say easier/safer than short-circuiting the switch as some have done.

Tools - screwdriver & WD40

1 use the screwdriver to push back the two retaining clips at the front of the bonnet catch that hold the switch unit in place

2 unplug the wire from the back of the switch

(do it this way in case you drop the switch!)

3 clean thoroughly the mirco-switch and housing unit. Ensure the 2 holes at the bottom of the housing unit are not blocked as this will help muck/water escape

4 reassemble!

Pictures...

Fully Assembled



Cleaned Micro-Switch & Housing





If you still have issues afterwards, you can bend the metal contact slightly outwards to ensure a better push.

Excellent,
Pictures always make things alot clearer

Thanks for this - been bugging me for too long. Getting screwdriver out! 2005 RRS HSE Arctic Frost (more like Scotch mist)

"When you are going through Hell - keep going!" Sir W Churchill

Free plumbing advice to fellow sufferers

Mine did this for the first time just the other day. So this is very timely, thanks. Robin
2008 Range Rover Sport TDV8
Gone:
Jaguar S-Type V8 4.2 Sport
MGZTT 190 2.5

I had this happen a few times and eventually just bought a replacement for approx £20.00. Just remember to mark where the existing one is located - getting it wrong can be a pain because the lid won't close properly.... '10 RRS 5.0 SC
'13 Cayman S